w3mbookmark.c:186:18: error: conflicting types for ‘getenv’; have ‘char *(void)’

[robert-scheck]

Building w3m v0.5.3+git20230121 on Fedora Rawhide using GCC 15 fails like this (likely C23-related):

gcc -Wall -Wnull-dereference -I. -I. -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=z13 -mtune=z14 -fasynchronous-unwind-tables -fstack-clash-protection  -I./libwc   -DHAVE_CONFIG_H -DAUXBIN_DIR=\"/usr/libexec/w3m\" -DCGIBIN_DIR=\"/usr/libexec/w3m/cgi-bin\" -DHELP_DIR=\"/usr/share/w3m\" -DETC_DIR=\"/etc\" -DCONF_DIR=\"/etc/w3m\" -DRC_DIR=\"~/.w3m\" -DLOCALEDIR=\"/usr/share/locale\"    -c -o w3mbookmark.o w3mbookmark.c
w3mbookmark.c: In function ‘main’:
w3mbookmark.c:186:18: error: conflicting types for ‘getenv’; have ‘char *(void)’
  186 |     extern char *getenv();
      |                  ^~~~~~
In file included from w3mbookmark.c:2:
/usr/include/stdlib.h:773:14: note: previous declaration of ‘getenv’ with type ‘char *(const char *)’
  773 | extern char *getenv (const char *__name) __THROW __nonnull ((1)) __wur;
      |              ^~~~~~
w3mbookmark.c:199:9: error: too many arguments to function ‘getenv’; expected 0, have 1
  199 |     p = getenv("REQUEST_METHOD");
      |         ^~~~~~ ~~~~~~~~~~~~~~~~
w3mbookmark.c:186:18: note: declared here
  186 |     extern char *getenv();
      |                  ^~~~~~
w3mbookmark.c:202:9: error: too many arguments to function ‘getenv’; expected 0, have 1
  202 |     p = getenv("CONTENT_LENGTH");
      |         ^~~~~~ ~~~~~~~~~~~~~~~~
w3mbookmark.c:186:18: note: declared here
  186 |     extern char *getenv();
      |                  ^~~~~~
w3mbookmark.c:212:9: error: too many arguments to function ‘getenv’; expected 0, have 1
  212 |     p = getenv("LOCAL_COOKIE_FILE");
      |         ^~~~~~ ~~~~~~~~~~~~~~~~~~~
w3mbookmark.c:186:18: note: declared here
  186 |     extern char *getenv();
      |                  ^~~~~~
make: *** [<builtin>: w3mbookmark.o] Error 1

[robert-scheck]

Fork mentioned in #304 addresses this with https://git.sr.ht/~rkta/w3m/commit/a7287bd7568fd627f2c6e6f86bc136bf0f76d210.